Objects that curve in a certain direction, like certain walls, helixes, stair cases etc. If I want to invert them so that they curve in the opposite direction, how can I easily accomplish this?
Also if you right click on an object in the world an option appears for mirroring the object to a set direction X, Y, or Z
right click on it while it is not currently selected
You can actually invert them using scale. You can even invert full groups. Say I'm building something that is symmetrical. I can build one side of it, group those pieces and then duplicate that group (using Cntrl - W) and then invert that group by setting the appropriate X, Y, Z to -1 instead of 1. Then I drag it into place. The mesh might look funny when you first do it, so just go into the group and move the meshes and hit Cntrl - Z to undo the move. This will fix their look.
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awesome. this has been frustrating me for months now. thanks 
Exactly what I was looking for! Thank you!